$(function () {
    var $height1 = $(window).height();

    $(".body").css('height', $height1 + 'px')
    var $tabheight = parseFloat($('.login').height());
    $(".login").css('margin-top', $height1 / 2 - $tabheight);
    $('#login').attr("disabled", true);  //登陆按钮不可用
    $('#login').css("background-color", 'gray');
    //-------------------------------------
    var show_num = [];
    draw(show_num);

    $("#canvas").on('click', function () { //验证码
        draw(show_num);
    })
    $("#text").on('keyup', function () {  //验证码键盘抬起事件
        var val = $(".input-val").val().toLowerCase();
        var num = show_num.join("");
        if (val == num) {
            $('#login').css("background-color", 'blue');
            $('#login').attr("disabled", false);

        } else {
            $('#login').css("background-color", 'gray');
            $('#login').attr("disabled", true);
        }
    })
    $("#text").on('blur', function () {  //验证码失去光标
        var val = $(".input-val").val().toLowerCase();

        var num = show_num.join("");
        num=num.toLowerCase();
        console.log(num)
        console.log(val)
        if (val == '') {
            alert('请输入验证码！');
        } else if (val == num) {
            $('#login').css("background-color", 'blue');
            $('#login').attr("disabled", false);

        } else {
            alert('验证码错误！请重新输入！');
            $(".input-val").val('');
            draw(show_num);
        }
    })


    //-----------------------------------
    $("#login").click(function () {
        var $id = $(".id").val();
        var $psword = $('.psword').val();
        console.log($id);
        $.ajax({
            type: "POST",
            url: "insert/loginInsert.php",
            dataType: "json",
            data: {
                id: $id,
                psword: $psword,
            },
            success: function (e) {
                alert("发送成功");
            },
            error: function (e) {
                alert("发送失败");
            },
        })
    })
})

function draw(show_num) {   //产生验证码
    var canvas_width = $('#canvas').width();
    var canvas_height = $('#canvas').height();
    var canvas = document.getElementById("canvas");//获取到canvas的对象，演员
    var context = canvas.getContext("2d");//获取到canvas画图的环境，演员表演的舞台
    canvas.width = canvas_width;
    canvas.height = canvas_height;
    var sCode = "A,B,C,E,F,G,H,J,K,L,M,N,P,Q,R,S,T,W,X,Y,Z,1,2,3,4,5,6,7,8,9,0";
    var aCode = sCode.split(",");
    var aLength = aCode.length;//获取到数组的长度

    for (var i = 0; i <= 3; i++) {
        var j = Math.floor(Math.random() * aLength);//获取到随机的索引值
        var deg = Math.random() * 30 * Math.PI / 180;//产生0~30之间的随机弧度
        var txt = aCode[j];//得到随机的一个内容
        show_num[i] = txt.toLowerCase();
        var x = 10 + i * 20;//文字在canvas上的x坐标
        var y = 20 + Math.random() * 8;//文字在canvas上的y坐标
        context.font = "bold 23px 微软雅黑";

        context.translate(x, y);
        context.rotate(deg);

        context.fillStyle = randomColor();
        context.fillText(txt, 0, 0);

        context.rotate(-deg);
        context.translate(-x, -y);
    }
    for (var i = 0; i <= 5; i++) { //验证码上显示线条
        context.strokeStyle = randomColor();
        context.beginPath();
        context.moveTo(Math.random() * canvas_width, Math.random() * canvas_height);
        context.lineTo(Math.random() * canvas_width, Math.random() * canvas_height);
        context.stroke();
    }
    for (var i = 0; i <= 30; i++) { //验证码上显示小点
        context.strokeStyle = randomColor();
        context.beginPath();
        var x = Math.random() * canvas_width;
        var y = Math.random() * canvas_height;
        context.moveTo(x, y);
        context.lineTo(x + 1, y + 1);
        context.stroke();
    }
}

function randomColor() {//得到随机的颜色值
    var r = Math.floor(Math.random() * 256);
    var g = Math.floor(Math.random() * 256);
    var b = Math.floor(Math.random() * 256);
    return "rgb(" + r + "," + g + "," + b + ")";
}
